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Homeostatic Control of Intake and Expensive Consumption
We have evolved to maintain body weight and body fat levels within a range that is neither too low nor too high. So we have all these responses that are mainly driven by a suite of different hormones. There's adaptations that the body puts in place to be able to account for a caloric deficit or surplus over a certain period of time. And it's because of this homeostatic control of intake and expenditure that we can see people who, without ever monitoring their food intake or calculating how much energy to expend on a given day, remain within a relatively stable body weight for years or decades.